One-hand arc lamp



April 15, 1930. M. J. WOHL 1,754,249

ONE-HAND ARC LAMP Filed Nov. 16. 1925 m avioewcoz :55 Fig. 4.

Patented Apr. 15, 1930 UNITED STATES PATENT OFFICE 4 MAURICE a. WOHL, or LONG ISLAND CITY, NEW YORK ONE-HAND ARC LAMP Application-filed mama- 16, 1925. Serial m. 69,538.

This invention relates to electric arc-lamps of the hand operated type and particularly to lamps used for photographic and medical purposes.

11 5 It "is the object of the present invention to provide a lamp which is extremely light in weight so that it may be carried andoperated by one hand. a b

It is another object of this invention to 1 provide a lamp which, although its electrodes 'are fed by hand, requires no careful adjustment by the operator, to produce orto hold an arc.

It is a further objectof the invention to 915' provide a relatively small lamp which holds an are at a fixed point and therefore may be used as a focussing lamp in connection with a lens or mirror.

With these and other objects in view, the

"320 invention consists in a novel arrangement of parts and details-of construction hereinafter fully described and finally pointed out in the claims. r H

In the drawing which'forms, a part of this '25 specification Fig. 1 is a side elevation of my hand lamp.

Fig. 2 is a front elevation of the lamp in the direction of arrows 22 of Fig; 1.

Fig. 3 is a top plan of Fig. 1, partly in Fig. 4 is a detail vertical section through the arc-former barrel 21 on line 44 of Fig. 2.

Fig. 5 is a sectional plan on line 5-5 of Referring to Fig. 1 of the drawing, 11 rep resents a substantially V shaped bar arranged horizontally which holds bymeans of a flat portion at the apex and by bolt 29 a concave mirror 12. While the inclined parts of bar 11 are resilient to form co-operating springs, it is not essential that the vertical portion between them isresilient. .Near mirror 12 the wide spaces of bars 11 are horizontal 45 transversely, they. are twisted-atll so that the forward partsll of the two arms are in the same vertical plane. At their front ends each of the diverging arms 11,? holds a carbon holder bracket 13," insulated from the arms 11 These arms are each provided with a.

trodes 16 and 17.

These electrodes are held perpendicular to arms 11 which gives them a considerable inclination with the horizontal axis AA of the mirror 12 and the whole lamp. To themiddle portion of the upper arm 11, ashort horizontal post 18 is pivotally fastened by means of a horizontal pivot 80. This post holds a vertical cylindricalrod 19 extending downwardly therefrom. The upper end of rod 19 is formed into a pivot 20 which turns in an aperture of post 18. To the middle portion of the lower arm 11, a. cylindrical barrel 21 is rotatably fastened by means of a pivot pin 22 about which it may rotate. y The rod 19 passes through the axis of barrel 21 and carries below the same a. stop collar 23 and at its lowest point a horizontal handle 24. Within the barrel 21 (see Fig. 4)

the rod 19 is encircled by a ring 25 which is made by winding a helical spring around this rod and'joining the two ends of the spring to each other. While spring 25 tightly embraces rod 19 its circumference is free from the side wall of barrel 21.

The top 21 of the barrel "21. carries a number of washers 26 of varying thicknesses suitably fastened thereto for increasing or decreasing the space between these washers and thebottom 21 of the barrel.

To bottom 21 is also. fas- By pressing the fingers against the handle 7 24 and plate 28 these elements approach each other, barrel 21'travels upward on rod 19 and electrodes 16 and 17 approach each other until they, reach the axis AA and form a contact, at their pointed ends, closing the circuit.

The lifting of barrel 21 caused'the r bottom plate 21 to travel upward until it touched the lower face of coiled spring 25 and then to shift this spring upward on rod 19 until the movement is arrested by the touching of the two electrodes. If then the manual pressure is released the spring 11 presses the two arms l1 uniformly apart from axis, AA. The barrel-21 descends on rod 19 until the lowest washer 26 therein touches the upper face of coiled spring 25.

This distance ofdescent is equal tothe distance between the bottom 21 and spring 25 before the barrel was lifted. The force of spring 11 is insufiicient to overcome the friction of coil spring 25 on rod 19 and therefore this spring acts as a positive stop for the opening movement of arms 11. The two electrodes 16 and 17 being held bythe arms 11 have opened adistance above and below axis A A the length or which is fixed by the above described" movement of washer 26 towards spr1ng25 andformed an are thereby on the focal axis of mirror 12.

When the electrodes burn off and the arc becomes too long the above described action is repeated and-a new are established on the focal axis of the same fixed length.

It is also possible to hold the arc at a shorter length than the standard distance fixed by the space between 25 and 21?, and to adjust it, by varying the hand pressure.

The collar 2' 3on rod 19 serves as a. stop for barrel 21 to prevent anexcessive separation of the electrodes.

' The lamp may be placed on a suitable stand in several ways. If the crescent shaped plate is' replaced by a flat plate or disk a stand is formed to place the lamp on a table. It may then .be operated by simply pressing upon handle 24. It may also easily be attachedto a stand by means of bolt 29.

It is evident that in addition to the mirror 12 a, focusing lens may be arranged in front of the electrodes on the focal axis for projec- 'tion purposes and suitably connected to the mirror on bolt 29.

This lamp is particularly suited for physicians inthe treatment of bacterial diseases on account of its lightness and easy operation. It may be carried and operatedby one hand and'the arc formed and maintained at correct length without gauging or adjusting the 'same. It may be brought close to the patient and used in anydesired direction.

This lampis avery desirable one for photographic purposes,if attached to a stand as above described. "The are ,once established holds. steady long, enough for. an exposure and can be restored to original length with facility and withoutdisturbing theexposure.

In addition to these advantages the construction of'the whole lamp is extremely simple and thenumber of itsparts in comparison with similar devices is greatly. reduced. It

ca'n 'therefore be manufactured and sold for .I claim as new, and desire to secure by Letters Patent is:

1; In an arc lamp a frame consisting of two arms joined to. each other at one end and holdingelectrodes at their free ends, resilient means oining said arms to separate said arms simultaneously equal distances from a commonaxis, means slidably guided by said arms, to move themquicklytowards, each;other vuntil said electrodes form a contact and.

means to form'an are between said electrodes operated by sald resilient means,

2. An arc lamp consisting of a pair of arms forming a V shaped frame, resilient ineans joined to both arms of said frame to separate said arms, electrodes at the free ends of said arms, means slidably connected to both. arms to move said electrodes quickly along distanceto forma contact, and means to form an are by releasing said sliding means a short distance. 7

3. In an arc lamp a pair of arms supporting electrodes, resilient means to separate said electrodes, clutch bperated means to form an arc of fixed length, a pair of sliding rods joining said arms forming common means for manual support of said lamp for quickly bringing said electrodes together and for operating said are forming means.

4'. In a lamp a .pairof electrodes, asupporting arm for each electrode, resilient means to spread said arms apart, aconnecting rod fastened to one of said arms and slidably held on thesecond arm, a friction collar on said rod and a pair of St PS on the second arm arranged on opposite sides of said collar to provide arcforming means for said lamp.

5. In a lamp a pair of electrodes, a supporting arm for each electrode, means for spreading said arms apart, means for formmg an arc,means for supporting said lamp attached to oneof said arms and means for operating saiclarc forming means attached tothe other arm,said arc forming means including a stop for fixing the length of; arc and meansto alter said fixed length.

6. In an arc lamp a pair ofelectrodes, a

supporting arm for each electrode, means for spreadingsaid arms apart, a rod connecting sa d arms pivotally held on. one arm, a guide for said rod pivotally held on the other arm, means slidablyheld on said rod and operated by said guide to vary the position of said arms and to form an are between said electrodes.

7. In an arc lamp a pair of electrodes, a supporting arm for each electrode in symmetrical position to a common axis, means for moving said arms simultaneously equal distances towards and away from said axis, a rod connecting said arms arranged perpendicularly to said axis, and means on one of said arms in slidable engagement With said rod to form an are between said electrodes 011 said axis.

8. In a lamp, a pair of electrodes, holders for said electrodes mounting them in are forming relation to each other, an operating rod to effect movement of one electrode towards the other, a friction collar on said rod and a pair of stops arranged on opposite sides of said collar to provide are forming means for said lamp. 7

9. In a lamp a pair of are forming electrodes, holders for said electrodes mounting them in are forming relation to each other, means to press said holders apart, an operating rod to effect movement of one electrode holder towards the other and friction means engaging said rod, a pair of stops on opposite sides of said friction means adapted to engage the same and to fir; the length of the are I formed When the said rod is released.

10. In a lamp a pair of are forming electrodes, arms holding said electrodes in angular relation to each other, means for normally separating said arms, operating means for pressing said arms together and friction means in engagement with said operating means and means co-operating with said friction means to limit the separation of said arms to strike an are by the release of said pressure.

11. In an arc lamp a pair of electrodes, supporting arms mounting said electrodes in are forming relation, spreading means to move said arms apart, a rod slidahly connected to one of said arms to move the electrode held thereon to a contact by manual pressure, friction means engaging said rod and means co-operating with said friction means to limit said spreading movement to form an are under action of said spreading means.

In testimony whereof, I have signed my name to this specification this 31st day of October, 1925.

MAURICE J. lVOI-IL. 

